Guide: Exhaust noise and the Law

[Rich306]

Conditions specified in paragraph I.3 of the Annex to Community Directive 77/212
Method specified in paragraph I.4.1 of the Annex to Community Directive 77/212
Requirements specified in heading II of the Annex to Community Directive 77/212 (except paragraphs II.2 and II.5).

I need to find this annex to Community Directive to find out the answer...

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Found it... http://eur-lex.europa.eu/LexUriServ/LexU...57:EN:HTML

From what I can tell...

At least two measurements shall be made on each side of the vehicle. Preliminary measurements may be made for adjustment purposes but shall be disregarded.

An engine speed equal to three-quarters of the maximum engine speed permitted by the governor

The third gear in the gearbox must be engaged if the box has more than four gears

Measurements shall be made at point X (shown in Figure 2) at a distance of 7 metres from the nearest surface of the vehicle. The microphone shall be situated 1.2 metres above ground level.

So 3rd gear, 3/4 revs, 7m away... How the chuff do they measure that on the road!?

I think the car would have to be taken to a garage rolling road.